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Development Tools HTTP Basics Introduction to HTTP Sending Data with a POST Request

503 Service Unavailable any suggestion?

When i make HTTP request it tells me the following:

First, this is the request:

$ telnet httpbin.org 80
Connected to httpbin.org.
Escape character is '^]'.
POST /post HTTP/1.1
Host: httpbin.org
Content-Length: 32



HTTP/1.1 503 Service Unavailable
Connection: keep-alive
Server: Cowboy
Date: Fri, 02 Mar 2018 14:40:10 GMT
Content-Length: 506
Content-Type: text/html; charset=utf-8
Cache-Control: no-cache, no-store

<!DOCTYPE html>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <meta charset="utf-8">
    <title>Application Error</title>
    <style media="screen">
      html,body,iframe {
        margin: 0;
        padding: 0;
      html,body {
        height: 100%;
        overflow: hidden;
      iframe {
        width: 100%;
        height: 100%;
        border: 0;
    <iframe src="//www.herokucdn.com/error-pages/application-error.html"></iframe>
</html>Connection closed by foreign host.

I did the same as the teacher did and unfortunately i got a server error 500. Am i missing something obvious ? any suggestion ? please^^.

1 Answer

Steven Parker
Steven Parker
218,596 Points

Try again? I cut your message and pasted it directly into my telnet, and I got a different response:

HTTP/1.1 200 OK
Connection: keep-alive
Server: meinheld/0.6.1
Date: Fri, 02 Mar 2018 15:26:20 GMT
Content-Type: application/json
Access-Control-Allow-Origin: *
Access-Control-Allow-Credentials: true
X-Powered-By: Flask
X-Processed-Time: 0
Content-Length: 284
Via: 1.1 vegur

    "args": {},
    "data": "firstname=hamza&language=English",
    "files": {},
    "form": {},
    "headers": {
        "Connection": "close",
        "Content-Length": "32",
        "Host": "httpbin.org"
    "json": null,
    "origin": "",
    "url": "http://httpbin.org/post"

(actual origin IP replaced with 123's)

Yes! It works now. I tried the same way before (several times) but it didn't work. I am wondering If the location affects the connectivity to the server ? Because i was in the village when doing the request.